From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CAFFBC4360D for ; Sun, 8 Sep 2019 13:00:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A08162081B for ; Sun, 8 Sep 2019 13:00:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1567947648; bh=kWirPRhxCKSta7xA/D6yO8wFVzggWcc5TYH6fXLVUjw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=ZhNtEGr6rG83b8PXpwC3NwOMnJc+3CMpVSfaDTX0qTMCra1uo73J7+zwNUuvT02AD seSwcc7wgI2n3zyi195lDwYRLIaxeq1r89IGoSZHxgBbM/9LZlcAOvvz+RDL84P+Zp 8iOr3vD6Q0F9/t++PN+9OVfh1HDFZzESKdZbRuBg= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729673AbfIHMoC (ORCPT ); Sun, 8 Sep 2019 08:44:02 -0400 Received: from mail.kernel.org ([198.145.29.99]:58346 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729654AbfIHMoA (ORCPT ); Sun, 8 Sep 2019 08:44:00 -0400 Received: from localhost (unknown [62.28.240.114]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 7BC382081B; Sun, 8 Sep 2019 12:43:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1567946639; bh=kWirPRhxCKSta7xA/D6yO8wFVzggWcc5TYH6fXLVUjw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TRo6nAu2DPPToZ496A1q73tqlxk97eECwg10gRHOwMomYw5NlCq+nw1h8tFppRLRU 6XeyaZR5C9CR8UST/+symez2ZRU2NO1eEu6HdWy9hSzb4Hu3wDnAZj2yVT2O1JJssm Vn3HOniP3IiPqmjQacevOc1YMLn65bD40CIwH0+w= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Tho Vu , Kazuya Mizuguchi , Simon Horman , "David S. Miller" , Sasha Levin Subject: [PATCH 4.9 11/26] ravb: Fix use-after-free ravb_tstamp_skb Date: Sun, 8 Sep 2019 13:41:50 +0100 Message-Id: <20190908121101.208546864@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20190908121057.216802689@linuxfoundation.org> References: <20190908121057.216802689@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org [ Upstream commit cfef46d692efd852a0da6803f920cc756eea2855 ] When a Tx timestamp is requested, a pointer to the skb is stored in the ravb_tstamp_skb struct. This was done without an skb_get. There exists the possibility that the skb could be freed by ravb_tx_free (when ravb_tx_free is called from ravb_start_xmit) before the timestamp was processed, leading to a use-after-free bug. Use skb_get when filling a ravb_tstamp_skb struct, and add appropriate frees/consumes when a ravb_tstamp_skb struct is freed. Fixes: c156633f1353 ("Renesas Ethernet AVB driver proper") Signed-off-by: Tho Vu Signed-off-by: Kazuya Mizuguchi Signed-off-by: Simon Horman Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/ethernet/renesas/ravb_main.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c index 480883a7a3e5e..545cb6262cffd 100644 --- a/drivers/net/ethernet/renesas/ravb_main.c +++ b/drivers/net/ethernet/renesas/ravb_main.c @@ -1,6 +1,6 @@ /* Renesas Ethernet AVB device driver * - * Copyright (C) 2014-2015 Renesas Electronics Corporation + * Copyright (C) 2014-2019 Renesas Electronics Corporation * Copyright (C) 2015 Renesas Solutions Corp. * Copyright (C) 2015-2016 Cogent Embedded, Inc. * @@ -512,7 +512,10 @@ static void ravb_get_tx_tstamp(struct net_device *ndev) kfree(ts_skb); if (tag == tfa_tag) { skb_tstamp_tx(skb, &shhwtstamps); + dev_consume_skb_any(skb); break; + } else { + dev_kfree_skb_any(skb); } } ravb_modify(ndev, TCCR, TCCR_TFR, TCCR_TFR); @@ -1537,7 +1540,7 @@ static netdev_tx_t ravb_start_xmit(struct sk_buff *skb, struct net_device *ndev) DMA_TO_DEVICE); goto unmap; } - ts_skb->skb = skb; + ts_skb->skb = skb_get(skb); ts_skb->tag = priv->ts_skb_tag++; priv->ts_skb_tag &= 0x3ff; list_add_tail(&ts_skb->list, &priv->ts_skb_list); @@ -1665,6 +1668,7 @@ static int ravb_close(struct net_device *ndev) /* Clear the timestamp list */ list_for_each_entry_safe(ts_skb, ts_skb2, &priv->ts_skb_list, list) { list_del(&ts_skb->list); + kfree_skb(ts_skb->skb); kfree(ts_skb); } -- 2.20.1